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7. Environmental influences on fatigue life
As organic matrices are sensitive to water, environmental conditions (humidity, temperature) coupled with mechanical stress can lead to irreversible degradation, which can severely affect the mechanical strength of composite parts in service. It is therefore imperative to know how the properties of the materials used evolve as they age, in order to predict their service life or strength beyond a given time. The influence of aging on material behavior is manifested by a lowering of the glass transition temperature T
g
of the matrix and a drop in mechanical characteristics (shear modulus, transverse modulus, fracture characteristics, etc.).
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Environmental influences on fatigue life
Fatigue sizing of composite structures
Bibliography
Software tools
Commercial finite element calculation codes (ABAQUS, ANSYS...) do not perform fatigue calculations, but calculate for a given number of cycles. The material characteristics then correspond to the residual properties for the number of cycles concerned. The question then remains: for which cycles is it wise to perform these calculations? The answer can be found in the cycle skipping techniques mentioned in [AM 5 410] § 8.2....
Events
ICFC5, Fifth International Conference on Fatigue of Composites 16-19, October 2010 Nanjing, China.
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Organizations – Federations – Associations (non-exhaustive list)SF2M, Société Française de Métallurgie et de Matériaux. Fatigue Commission http://www.sf2m.asso.fr
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